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A neutron collides elastically with the ...

A neutron collides elastically with the stationary nucleus of an atom of mass number A. If the collision is perfectly elastic, then after the collision the fraction of the initial kinetic energy retained by the neutron, is

A

`((A-1)/(A+1))^(2)`

B

`((A+1)/(A-1))^(2)`

C

`((A-1)/(A))^(2)`

D

`((A+1)/(A))^(2)`

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The correct Answer is:
A
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